// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_

#include <memory>
#include <vector>

#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/loader/global_routing_id.h"
#include "content/browser/renderer_host/overscroll_controller_delegate.h"
#include "content/browser/renderer_host/render_view_host_delegate_view.h"
#include "content/browser/web_contents/web_contents_view.h"
#include "content/common/content_export.h"
#include "ui/aura/client/drag_drop_delegate.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_observer.h"

namespace aura {
class Window;
}

namespace ui {
class DropTargetEvent;
class TouchSelectionController;
}

namespace content {
class GestureNavSimple;
class OverscrollNavigationOverlay;
class RenderWidgetHostImpl;
class RenderWidgetHostViewAura;
class TouchSelectionControllerClientAura;
class WebContentsViewDelegate;
class WebContentsImpl;
class WebDragDestDelegate;

class CONTENT_EXPORT WebContentsViewAura
    : NON_EXPORTED_BASE(public WebContentsView),
      public RenderViewHostDelegateView,
      public OverscrollControllerDelegate,
      public aura::WindowDelegate,
      public aura::client::DragDropDelegate,
      public aura::WindowObserver {
public:
    WebContentsViewAura(WebContentsImpl* web_contents,
        WebContentsViewDelegate* delegate);

    // Allow the WebContentsViewDelegate to be set explicitly.
    void SetDelegateForTesting(WebContentsViewDelegate* delegate);

    // Set a flag to pass nullptr as the parent_view argument to
    // RenderWidgetHostViewAura::InitAsChild().
    void set_init_rwhv_with_null_parent_for_testing(bool set)
    {
        init_rwhv_with_null_parent_for_testing_ = set;
    }

private:
    class WindowObserver;

    ~WebContentsViewAura() override;

    void SizeChangedCommon(const gfx::Size& size);

    void EndDrag(RenderWidgetHost* source_rwh, blink::WebDragOperationsMask ops);

    void InstallOverscrollControllerDelegate(RenderWidgetHostViewAura* view);

    // Sets up the content window in preparation for starting an overscroll
    // gesture.
    void PrepareContentWindowForOverscroll();

    // Completes the navigation in response to a completed overscroll gesture.
    // The navigation happens after an animation (either the overlay window
    // animates in, or the content window animates out).
    void CompleteOverscrollNavigation(OverscrollMode mode);

    void OverscrollUpdateForWebContentsDelegate(float delta_y);

    ui::TouchSelectionController* GetSelectionController() const;
    TouchSelectionControllerClientAura* GetSelectionControllerClient() const;

    // Returns GetNativeView unless overridden for testing.
    gfx::NativeView GetRenderWidgetHostViewParent() const;

    // Returns whether |target_rwh| is a valid RenderWidgetHost to be dragging
    // over. This enforces that same-page, cross-site drags are not allowed. See
    // crbug.com/666858.
    bool IsValidDragTarget(RenderWidgetHostImpl* target_rwh) const;

    // Overridden from WebContentsView:
    gfx::NativeView GetNativeView() const override;
    gfx::NativeView GetContentNativeView() const override;
    gfx::NativeWindow GetTopLevelNativeWindow() const override;
    void GetScreenInfo(ScreenInfo* screen_info) const override;
    void GetContainerBounds(gfx::Rect* out) const override;
    void SizeContents(const gfx::Size& size) override;
    void Focus() override;
    void SetInitialFocus() override;
    void StoreFocus() override;
    void RestoreFocus() override;
    DropData* GetDropData() const override;
    gfx::Rect GetViewBounds() const override;
    void CreateView(const gfx::Size& initial_size,
        gfx::NativeView context) override;
    RenderWidgetHostViewBase* CreateViewForWidget(
        RenderWidgetHost* render_widget_host,
        bool is_guest_view_hack) override;
    RenderWidgetHostViewBase* CreateViewForPopupWidget(
        RenderWidgetHost* render_widget_host) override;
    void SetPageTitle(const base::string16& title) override;
    void RenderViewCreated(RenderViewHost* host) override;
    void RenderViewSwappedIn(RenderViewHost* host) override;
    void SetOverscrollControllerEnabled(bool enabled) override;

    // Overridden from RenderViewHostDelegateView:
    void ShowContextMenu(RenderFrameHost* render_frame_host,
        const ContextMenuParams& params) override;
    void StartDragging(const DropData& drop_data,
        blink::WebDragOperationsMask operations,
        const gfx::ImageSkia& image,
        const gfx::Vector2d& image_offset,
        const DragEventSourceInfo& event_info,
        RenderWidgetHostImpl* source_rwh) override;
    void UpdateDragCursor(blink::WebDragOperation operation) override;
    void GotFocus() override;
    void TakeFocus(bool reverse) override;
#if defined(USE_EXTERNAL_POPUP_MENU)
    void ShowPopupMenu(RenderFrameHost* render_frame_host,
        const gfx::Rect& bounds,
        int item_height,
        double item_font_size,
        int selected_item,
        const std::vector<MenuItem>& items,
        bool right_aligned,
        bool allow_multiple_selection) override;

    void HidePopupMenu() override;
#endif

    // Overridden from OverscrollControllerDelegate:
    gfx::Rect GetVisibleBounds() const override;
    bool OnOverscrollUpdate(float delta_x, float delta_y) override;
    void OnOverscrollComplete(OverscrollMode overscroll_mode) override;
    void OnOverscrollModeChange(OverscrollMode old_mode,
        OverscrollMode new_mode) override;

    // Overridden from aura::WindowDelegate:
    gfx::Size GetMinimumSize() const override;
    gfx::Size GetMaximumSize() const override;
    void OnBoundsChanged(const gfx::Rect& old_bounds,
        const gfx::Rect& new_bounds) override;
    gfx::NativeCursor GetCursor(const gfx::Point& point) override;
    int GetNonClientComponent(const gfx::Point& point) const override;
    bool ShouldDescendIntoChildForEventHandling(
        aura::Window* child,
        const gfx::Point& location) override;
    bool CanFocus() override;
    void OnCaptureLost() override;
    void OnPaint(const ui::PaintContext& context) override;
    void OnDeviceScaleFactorChanged(float device_scale_factor) override;
    void OnWindowDestroying(aura::Window* window) override;
    void OnWindowDestroyed(aura::Window* window) override;
    void OnWindowTargetVisibilityChanged(bool visible) override;
    bool HasHitTestMask() const override;
    void GetHitTestMask(gfx::Path* mask) const override;

    // Overridden from ui::EventHandler:
    void OnKeyEvent(ui::KeyEvent* event) override;
    void OnMouseEvent(ui::MouseEvent* event) override;

    // Overridden from aura::client::DragDropDelegate:
    void OnDragEntered(const ui::DropTargetEvent& event) override;
    int OnDragUpdated(const ui::DropTargetEvent& event) override;
    void OnDragExited() override;
    int OnPerformDrop(const ui::DropTargetEvent& event) override;

    // Overridden from aura::WindowObserver:
    void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;

    FRIEND_TEST_ALL_PREFIXES(WebContentsViewAuraTest, EnableDisableOverscroll);

    std::unique_ptr<aura::Window> window_;

    std::unique_ptr<WindowObserver> window_observer_;

    // The WebContentsImpl whose contents we display.
    WebContentsImpl* web_contents_;

    std::unique_ptr<WebContentsViewDelegate> delegate_;

    blink::WebDragOperationsMask current_drag_op_;

    std::unique_ptr<DropData> current_drop_data_;

    WebDragDestDelegate* drag_dest_delegate_;

    // We keep track of the RenderWidgetHost we're dragging over. If it changes
    // during a drag, we need to re-send the DragEnter message.
    base::WeakPtr<RenderWidgetHostImpl> current_rwh_for_drag_;

    // We also keep track of the ID of the RenderViewHost we're dragging over to
    // avoid sending the drag exited message after leaving the current view.
    GlobalRoutingID current_rvh_for_drag_;

    // We track the IDs of the source RenderProcessHost and RenderViewHost from
    // which the current drag originated. These are used to ensure that drag
    // events do not fire over a cross-site frame (with respect to the source
    // frame) in the same page (see crbug.com/666858). Specifically, the
    // RenderViewHost is used to check the "same page" property, while the
    // RenderProcessHost is used to check the "cross-site" property. Note that the
    // reason the RenderProcessHost is tracked instead of the RenderWidgetHost is
    // so that we still allow drags between non-contiguous same-site frames (such
    // frames will have the same process, but different widgets). Note also that
    // the RenderViewHost may not be in the same process as the RenderProcessHost,
    // since the view corresponds to the page, while the process is specific to
    // the frame from which the drag started.
    int drag_start_process_id_;
    GlobalRoutingID drag_start_view_id_;

    // The overscroll gesture currently in progress.
    OverscrollMode current_overscroll_gesture_;

    // This is the completed overscroll gesture. This is used for the animation
    // callback that happens in response to a completed overscroll gesture.
    OverscrollMode completed_overscroll_gesture_;

    // This manages the overlay window that shows the screenshot during a history
    // navigation triggered by the overscroll gesture.
    std::unique_ptr<OverscrollNavigationOverlay> navigation_overlay_;

    std::unique_ptr<GestureNavSimple> gesture_nav_simple_;

    bool init_rwhv_with_null_parent_for_testing_;

    DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
};

} // namespace content

#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
